On duplicate key update inserts or updates a row, the last_insert_id() function returns the auto_increment value. the on duplicate key update clause can contain multiple column assignments, separated by commas.. The statement above sets the value of the c1 to its current value specified by the expression values(c1) plus 1 if there is a duplicate in unique index or primary key. mysql insert on duplicate key update example. let’s take a look at an example of using the insert on duplicate key update to understand how it works.. The on duplicate key update clause can contain multiple column assignments, separated by commas. in assignment value expressions in the on duplicate key update clause, you can use the values(col_name) function to refer to column values from the insert portion of the insert on duplicate key update statement..
Description: - we are using the mysql replace statement to update a table. - that table has an auto_increment primary key. - whenever we update a record in that table, the a new auto_increment primary key is allocated.. I have a bit of a strange question. i know about insert on duplicate key update. my question is, is there something similar for deletes that fail because of foreign key constraints? for example: delete from table1 where value='something'; but, table2 has a foreign key that depends on the the value i want to delete in table1, so the delete fails.. Query. hi , i am trying to write a query in postgres, for inserting values into a table , however if that insert were to insert a row with a duplicate key, it should update the original record in some manner., the duplicate key here is a foreign key so i am not sure how to check it out..
